Outermost layer of the cell and serves to separate and protect a cell from its surrounding environment. - Mainly composed of lipids and proteins

Outermost layer of the cell and serves to separate and protect a cell from its surrounding environment. - Mainly composed of lipids and proteins

• A. Cell Membrane
• B. Nucleus
• C. Cytoplasm
• D. Organ

Answer: (A)

This item tests understanding of the cell’s outer boundary and its composition. The outermost layer is the cell membrane, a phospholipid bilayer with proteins embedded in it. This arrangement creates a flexible, protective barrier that separates the cell’s interior from the surrounding environment and regulates what can cross in and out, enabling selective transport and communication. The nucleus is the interior control center that houses genetic material, the cytoplasm is the internal fluid where many metabolic activities occur, and an organ is a structure within the cell, not the boundary itself.

This item tests understanding of the cell’s outer boundary and its composition. The outermost layer is the cell membrane, a phospholipid bilayer with proteins embedded in it. This arrangement creates a flexible, protective barrier that separates the cell’s interior from the surrounding environment and regulates what can cross in and out, enabling selective transport and communication. The nucleus is the interior control center that houses genetic material, the cytoplasm is the internal fluid where many metabolic activities occur, and an organ is a structure within the cell, not the boundary itself.